Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite

Table 1

Constants and coefficients of kinetic models.

Aquifers	Pseudo-first-order kinetics			Pseudo-second-order kinetics			Elovich model			Intraparticle diffusion model
	k1 (min^−1)	Qe (mg/g)	R^2	k2 (g/mg·min)	Qe (mg/g)	R^2	α (mg/g·min)	β (g/mg)	R^2	a	ki (mg/g· min^1/2)	R^2
	Clay	0.0215	0.83	0.455	0.1382	1.27	0.996	16.49	0.1845	0.912	0.6252	0.0380	0.775
Silty clay	0.0281	1.49	0.828	0.0376	1.02	0.998	3.575	0.1815	0.990	0.3231	0.0384	0.889
Silt	0.0276	0.82	0.617	0.0246	0.87	0.995	2.679	0.1713	0.930	0.2652	0.0334	0.753